Re: 'twave' in function g2gsh

From: Dennis Shea (shea AT
Date: Mon Dec 06 2004 - 15:23:51 MST

>I am trying to interpolate data from 160x320 resolution (ERA40 TL159 )
>to 94x192 resolution (NCEP/NCAR reanalysis) in order to do some
>comparisons. When trying to use function g2gsh, I was confused by
>parameter 'twave', does anybody have an idea which number should I
>choose for twave, does it matter a lot?
Yes, 62 :-)

Spectral models generally truncate the short waves
for numerical stability reasons. The NCEP Reanalysis
uses triangular truncation at wave 62.

good luck

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